xcode 10.1: Timer stops at 1 not 0 - swift

Question

Yep, I have seen a few questions similar to mine but for some reason, I couldn't duplicate it! If I use == or <= with If both are giving me stop at 1. The only < gave me the 0 stops which are good, but very rare I got -1. Any help, please?
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var timeLabel: UILabel!
#IBOutlet weak var startButton: UIButton!
var timer = Timer()
var timeLeft = 10
override func viewDidLoad() {
timeLabel.text = String(10)
super.viewDidLoad()
}
#IBAction func pressTimer(_ sender: Any) {
startButton.isEnabled = false
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(startTime), userInfo: nil, repeats: true)
}
#objc func startTime() {
timeLeft -= 1
timeLabel.text = "\(timeLeft)"
if timeLeft < 0 {
startButton.isEnabled = false
self.timer.invalidate()
}
}
}

Answer 1

My suggestion is to declare the timer as optional and check for zero before decrementing the counter.
And set the counter to 10 in the pressTimer method
class ViewController: UIViewController {
#IBOutlet weak var timeLabel: UILabel!
#IBOutlet weak var startButton: UIButton!
var timer : Timer?
var timeLeft = 0
#IBAction func pressTimer(_ sender: Any) {
startButton.isEnabled = false
timeLeft = 10
timeLabel.text = String(timeLeft)
if timer == nil {
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(startTime), userInfo: nil, repeats: true)
}
}
#objc func startTime()
{
if timeLeft == 0 {
startButton.isEnabled = false // shouldn't it be true??
timer?.invalidate()
timer = nil
} else {
timeLeft -= 1
timeLabel.text = String(timeLeft)
}
}
}